Searchers say two signals detected in the southern Indian Ocean show "some promise" they may be from missing flight MH370.
Retired Air Chief Marshal Angus Houston, head of the international search, said Chinese patrol vessel Haixun 01 picked up two "acoustic events" some 1,000 miles (1,600km) northwest of Perth.
The first was a faint signal. The second was picked up around 2km away and lasted for 90 seconds, he said.
They had a "ping" of 37.5kHz frequency - the same emitted by black box flight recorders.
The location where the signal was detectedA Chinese air force plane also spotted a number of white floating objects in the area, said Chinese state news agency Xinhua.
Mr Houston stressed that investigators are still a "long way" from concluding the signals are from the Boeing 777 carrying 239 people.
But he said they are "an important and encouraging lead" and show "some promise and require a full investigation".
The Malaysia Airlines plane vanished on March 8Australia is sending two ships - HMS Echo and defence vessel Ocean Shield - to investigate the patch of sea, which is some 4,500 metres deep.
Earlier, Australian Prime Minister Tony Abbott told reporters in Tokyo: "This is the most difficult search in human history.
"We are searching for an aircraft which is at the bottom of a very deep ocean and it is a very, very wide search area.
Hishammuddin Hussein at a news conference in Malaysia on Saturday"We need to be very careful about coming to hard and fast conclusions too soon."
A dozen planes and 13 ships are scouring three areas about 1,240 miles (2,000 km) northwest of Perth.
Malaysia said on Saturday it had launched a formal investigation into the plane's disappearance that would include experts from Britain, Australia, the US, China and France.
The country's acting defence minister Hishammuddin Hussein said it would be made up of three groups.
The first would examine maintenance records, structures and systems.
The second would study flight recorders, operations and meteorology.
The third, a "medical and human factors" group, would look into psychology, pathology and survival.
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